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Pandemic Influenza A/H1N1 Viral Pneumonia without Co-Infection in Korea: Chest CT Findings
( Jun Seong Son ),( Yee Hyung Kim ),( Young Kyung Lee ),( So Young Park ),( Cheon Woong Choi ),( Myung Jae Park ),( Jee Hong Yoo ),( Hong Mo Kang ),( Jong Hoo Lee ),( Bo Ram Park ) 대한결핵 및 호흡기학회 2011 Tuberculosis and Respiratory Diseases Vol.70 No.5
Background: To evaluate chest CT findings of pandemic influenza A/H1N1 pneumonia without co-infection. Methods: Among 56 patients diagnosed with pandemic influenza A/H1N1 pneumonia, chest CT was obtained in 22 between October 2009 and Februrary 2010. Since two patients were co-infected with bacteria, the other twenty were evaluated. Predominant parenchymal patterns were categorized into consolidation, ground glass opacity (GGO), and mixed patterns. Distribution of parenchymal abnormalities was assessed. Results: Median age was 46.5 years. The CURB-65 score, which is the scoring system for severity of community acquired pneumonia, had a median of 1. Median duration of symptoms was 3 days. All had abnormal chest x-ray findings. The median number of days after the hospital visit that Chest CT was performed was 1. The reasons for chest CT performance were radiographic findings unusual for pneumonia (n=13) and unexplained dyspnea (n=7). GGO was the most predominant pattern on CT (n=13, 65.0%). Parenchymal abnormalities were observed in both lungs in 13 cases and were more extensive in the lower lung zone than the upper. Central and peripheral distributions were identified in ten and nine cases, respectively. One showed diffuse distribution. Peribronchial wall thickening was found in 16 cases. Centrilobular branching nodules (n=7), interlobular septal thickening (n=4), atelectasis (n=1), pleural effusion (n=5), enlarged hilar and mediastinal lymph nodes (n=6 and n=7) were also noted. Conclusion: Patchy and bilateral GGO along bronchi with predominant involvement of lower lungs are the most common chest CT findings of pandemic influenza A/H1N1 pneumonia.
Study on Condensation Heat Transfer Characteristics of Hydrocarbons Natural Refrigerants
Oh, Hoo-Kyu,Park, Seung-Jun,Park, Ki-Won,Roh, Geon-Sang,Jeong, Jae-Cheon The Society of Air-Conditioning and Refrigerating 2001 International Journal Of Air-Conditioning and Refr Vol.9 No.3
This study investigated the condensation heat transfer coefficients of R-22, R-290 and R-600a inside horizontal tube. Heat transfer measurements were performed for smooth tube with inside diameter of 10.07 mm and outside diameter of 12.07 mm and inner grooved tube having 75 fins whose height is 0.25 mm. Condensation temperatures and mass velocity were ranged from 308K to 323 K and $51kg/m^2s$ to $250kg/m^2s$, respectively. The test results showed that the local condensation heat transfer coefficients increased as the mass flux increased, and also the effects of mass velocity on heat transfer coefficients of R-290 and R-600a were less than those of R-22. Average condensation heat transfer coefficients of natural refrigerants were superior to that of R-22. The present results had a good agreement with Cavallini-Zecchin's correlation for smooth and inner grooved tubes.
Pandemic Influenza A/H1N1 Viral Pneumonia without Co-Infection in Korea: Chest CT Findings
Son, Jun-Seong,Kim, Yee-Hyung,Lee, Young-Kyung,Park, So-Young,Choi, Cheon-Woong,Park, Myung-Jae,Yoo, Jee-Hong,Kang, Hong-Mo,Lee, Jong-Hoo,Park, Bo-Ram The Korean Academy of Tuberculosis and Respiratory 2011 Tuberculosis and Respiratory Diseases Vol.70 No.5
Background: To evaluate chest CT findings of pandemic influenza A/H1N1 pneumonia without co-infection. Methods: Among 56 patients diagnosed with pandemic influenza A/H1N1 pneumonia, chest CT was obtained in 22 between October 2009 and Februrary 2010. Since two patients were co-infected with bacteria, the other twenty were evaluated. Predominant parenchymal patterns were categorized into consolidation, ground glass opacity (GGO), and mixed patterns. Distribution of parenchymal abnormalities was assessed. Results: Median age was 46.5 years. The CURB-65 score, which is the scoring system for severity of community acquired pneumonia, had a median of 1. Median duration of symptoms was 3 days. All had abnormal chest x-ray findings. The median number of days after the hospital visit that Chest CT was performed was 1. The reasons for chest CT performance were radiographic findings unusual for pneumonia (n=13) and unexplained dyspnea (n=7). GGO was the most predominant pattern on CT (n=13, 65.0%). Parenchymal abnormalities were observed in both lungs in 13 cases and were more extensive in the lower lung zone than the upper. Central and peripheral distributions were identified in ten and nine cases, respectively. One showed diffuse distribution. Peribronchial wall thickening was found in 16 cases. Centrilobular branching nodules (n=7), interlobular septal thickening (n=4), atelectasis (n=1), pleural effusion (n=5), enlarged hilar and mediastinal lymph nodes (n=6 and n=7) were also noted. Conclusion: Patchy and bilateral GGO along bronchi with predominant involvement of lower lungs are the most common chest CT findings of pandemic influenza A/H1N1 pneumonia.
Ju, Sang-Jun,Jang, Gun-Eik,Jang, Yeo-Won,Kim, Hyun-Hoo,Lee, Cheon The Korean Institute of Electrical and Electronic 2016 Transactions on Electrical and Electronic Material Vol.17 No.3
The CrN/TiN/Al thin films for solar selective absorber were prepared by dc reactive magnetron sputtering with multi targets. The binary nitride CrN layer deposited with change in N<sub>2</sub> gas flow rates. The gas mixture of Ar and N2 was an important parameter during sputtering deposition because the metal volume fraction (MVF) was controlled by the N2 gas flow rate. In this study, the crystallinity and surface properties of the CrN/TiN/Al thin films were estimated by X-ray diffraction (XRD), atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM). The composition and depth profile of thin films were investigated using Auger electron spectroscopy (AES). The absorptance and reflectance with wavelength spectrum were recorded by UV-Vis-NIR spectrophotometry at a range of 300~1,100 nm.
CBS-dust 치환에 따른 고로슬래그 다량치환 시멘트 벽돌 품질에 미치는 영향
한준희 ( Han¸ Jun-hui ),한수환 ( Han¸ Soo-hwan ),김수호 ( Kim¸ Su-hoo ),윤치환 ( Yoon¸ Chi-whan ),한민철 ( Han¸ Min-cheol ),한천구 ( Han¸ Cheon-goo ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
This study examines the performance of CBS-Dust for the utilization of cement bricks as alkali stimulants for furnace slag replacement binders. It converts the CBS-Dust substitution rate and the excess slag substitution rate. According to the analysis, when replacing CBS-Dust with 65~70 % of BS substitution rate and 7.5~10 % of CBS-Dust, it shows excellent performance as an alkali stimulant of BS' potential hydrophobic reaction, and it is expected to be effective for secondary products of BS replaced in large quantities.
Growth and Properties of CrNx/TiNy/Al Based on N2 Gas Flow Rate for Solar Thermal Applications
Gun-Eik Jang,Sang-Jun Ju,Yeo-Won Jang,Hyun-Hoo Kim,Cheon Lee 한국전기전자재료학회 2016 Transactions on Electrical and Electronic Material Vol.17 No.3
The CrN/TiN/Al thin films for solar selective absorber were prepared by dc reactive magnetron sputtering with multitargets. The binary nitride CrN layer deposited with change in N2 gas flow rates. The gas mixture of Ar and N2 was animportant parameter during sputtering deposition because the metal volume fraction (MVF) was controlled by theN2 gas flow rate. In this study, the crystallinity and surface properties of the CrN/TiN/Al thin films were estimated byX-ray diffraction (XRD), atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM). The composition and depth profile of thin films were investigated using Auger electron spectroscopy (AES). Theabsorptance and reflectance with wavelength spectrum were recorded by UV-Vis-NIR spectrophotometry at a rangeof 300~1,100 nm.
CGS 치환유무 및 시멘트 종류 변화에 따른 콘크리트의 물리적 특성
김수호(Kim, Su Hoo),후 윈 야 오(Hu, Yun Yao),한준희(Han, Jun Hui),윤치환(Yoon, Chee Hwan),한민철(Han, Min Cheol),한천구(Han, Cheon Goo) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구에서는 CGS를 잔골재로 치환하여 프리믹스 시멘트 종류 변화에 따른 콘크리트의 물리적인 특성을 확인하고자 하였다. 분석결과 CGS를 치환함에 따라 고성능 감수제 사용량이 감소하고 AE제 사용량은 증가하였다. CGS는 압축강도에 큰 영향을 미치지 않음을 확인할 수 있었다. In this study, Coal gasification slag(CGS) was replaced with fine aggregate to verify the physical properties of the concrete according to the change in cement type. As a result of the study, the use of CGS resulted in a decrease of superplasticizer and an decrease of AE agent. CGS did npt affect the compressive strength remarkably.
전처리에 의한 개질 CGS를 잔골재로 활용한 모르타르의 기초적 특성
김수호 ( Kim Su-hoo ),백성진 ( Beak Sung-jin ),임군수 ( Lim Gun-su ),한준희 ( Han Jun-hui ),김종 ( Kim Jong ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
This study analyzed the basic characteristics of mortar using CGS modified by pretreatment. As a result of the analysis, it was found that CGS after reforming can be partially replaced with fine aggregates to solve the existing air volume reduction problem when used, and can contribute positively in terms of securing fluidity and improving strength. Therefore, it is considered necessary to verify as a functional material of CGS through concrete durability experiments as a future task.